Panlobular Emphysema: Know About The Causes and Treatments

Written by Medicover Team and Medically Reviewed by Dr Alla Bhagyaraj , Pulmonologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Chronic obstructive pulmonary disease (COPD) encompasses a range of progressive lung conditions, including emphysema. Among the types of emphysema, panlobular emphysema (PLE), also known as panacinar emphysema, stands out for its distinct characteristics and impact on respiratory function.

Panlobular emphysema involves uniform destruction of the alveoli throughout the entire acinus, reducing the lungs' ability to exchange oxygen and carbon dioxide effectively. The condition is strongly associated with alpha-1 antitrypsin (AAT) deficiency, although smoking and other environmental exposures can worsen lung damage.

What are the Types of Panlobular Emphysema?

Panlobular emphysema is a subtype of emphysema characterized by relatively uniform destruction of the alveoli throughout the entire acinus.

Panlobular Emphysema: Involves relatively uniform destruction of the respiratory acinus and is commonly associated with alpha-1 antitrypsin deficiency.
Centrilobular Emphysema: Primarily affects the central portions of the secondary pulmonary lobules and is more strongly associated with smoking.

Distinguishing panlobular emphysema from other forms of emphysema helps doctors determine the underlying cause and develop an appropriate treatment plan.

What are the Symptoms of Panlobular Emphysema?

The symptoms of panlobular emphysema may develop gradually and become more noticeable as lung function declines. Common symptoms include:

Shortness of breath: Breathlessness may initially occur during physical activity and become more persistent as the condition progresses.
Chronic cough: A persistent cough may occur, sometimes accompanied by sputum production.
Wheezing: A high-pitched whistling sound during breathing may occur because of airflow obstruction.
Fatigue: Reduced oxygen exchange can contribute to chronic fatigue and reduced exercise tolerance.
Weight loss: Advanced emphysema may cause unintended weight loss because breathing requires increased energy expenditure.

What are the Causes of Panlobular Emphysema?

Panlobular emphysema is primarily associated with genetic and environmental factors. The most important underlying cause is alpha-1 antitrypsin (AAT) deficiency, a genetic condition that reduces protection against enzymes that can damage lung tissue.

Alpha-1 antitrypsin deficiency: This inherited condition reduces a protein that protects lung tissue from enzymatic damage and is strongly associated with panlobular emphysema.
Smoking: Smoking can accelerate lung damage and worsen emphysema, particularly in people with underlying AAT deficiency.
Occupational exposures: Long-term exposure to dust, chemicals, fumes, and other harmful pollutants can contribute to lung damage.
Respiratory infections: Recurrent respiratory infections can worsen lung function and contribute to disease progression.

When to See a Doctor for Panlobular Emphysema?

Consult a pulmonologist if persistent breathing problems, chronic cough, or reduced exercise tolerance develop, especially if you have a history of smoking or a family history of alpha-1 antitrypsin deficiency.

Shortness of breath during daily activities or exercise
Chronic cough with sputum or wheezing
Persistent fatigue or reduced exercise tolerance
Unexplained weight loss or worsening breathing difficulties

Get medical help immediately if:

Severe breathlessness or difficulty breathing at rest
Chest tightness or signs of low oxygen levels
Sudden worsening of breathing or respiratory distress

These symptoms may indicate a severe exacerbation or another serious respiratory complication requiring urgent care.

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How Is Panlobular Emphysema Diagnosed?

Diagnosis of panlobular emphysema involves a combination of medical history, physical examination, imaging studies, and pulmonary function testing. Doctors may also evaluate for alpha-1 antitrypsin deficiency, particularly in younger patients or those with a family history of emphysema.

Clinical Evaluation

A thorough medical history and physical examination help identify risk factors such as smoking, occupational exposures, respiratory symptoms, and a family history of alpha-1 antitrypsin deficiency. Physical examination may reveal reduced breath sounds or increased use of accessory muscles during breathing.

Imaging Studies

High-resolution computed tomography (HRCT) can show the pattern and extent of alveolar destruction and help distinguish panlobular emphysema from other forms of emphysema.

Pulmonary Function Tests

Pulmonary function tests (PFTs) assess airflow obstruction and overall lung function. Important measurements include forced expiratory volume in one second (FEV1) and forced vital capacity (FVC).

Alpha-1 Antitrypsin Testing

Blood testing can measure alpha-1 antitrypsin levels. Genetic testing may also be performed to identify mutations in the SERPINA1 gene associated with AAT deficiency.

What are the Treatment Options for Panlobular Emphysema?

Panlobular emphysema is a chronic condition, and treatment focuses on slowing disease progression, improving breathing, preventing exacerbations, and maintaining quality of life.

Lifestyle Modifications

Smoking cessation: Quitting smoking is essential to reduce further lung damage and slow disease progression.
Exercise and pulmonary rehabilitation: Supervised exercise and breathing training can improve exercise tolerance and respiratory function.
Nutrition: A balanced diet can help maintain a healthy body weight and support overall health.

Medications

Bronchodilators: These medicines relax airway muscles and help improve airflow.
Inhaled corticosteroids: These may be prescribed for selected patients to reduce airway inflammation and exacerbations.
Antibiotics: These may be used when a bacterial respiratory infection is present.
Alpha-1 antitrypsin augmentation therapy: Intravenous AAT replacement may be considered for eligible individuals with severe AAT deficiency.

Oxygen Therapy

Supplemental oxygen may be prescribed for people with severe or chronic low blood oxygen levels to maintain adequate oxygenation and reduce symptoms.

Surgical Interventions

Lung volume reduction surgery (LVRS): In selected patients, removing severely damaged portions of the lung may improve the function of the remaining lung tissue.
Lung transplantation: Lung transplantation may be considered for selected patients with advanced, end-stage disease who do not respond adequately to other treatments.

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What are the Risk Factors of Panlobular Emphysema?

Several factors can increase the risk of developing or worsening panlobular emphysema, particularly in people with an underlying genetic susceptibility.

Alpha-1 antitrypsin deficiency
Smoking or exposure to secondhand smoke
Long-term exposure to dust, chemicals, fumes, or air pollutants
Family history of emphysema or AAT deficiency
Recurrent respiratory infections

What are the Complications of Panlobular Emphysema?

Progressive destruction of lung tissue can reduce respiratory function and increase the risk of complications, particularly when the condition is severe.